systemd: Add kmod option

Without kmod, the udev daemon is unable to run builtin kmod operations
for loading modules on demand. This breaks automatic loading via
modalias, meaning hotplugged USB devices won't have their modules
loaded.

(From meta-phosphor rev: 1b024a64b7a12b075556f19030a26182f2951a9c)

Change-Id: I32293fa5c206830eb3cfa84a0582db71886dd030
Signed-off-by: William A. Kennington III <wak@google.com>
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/meta-phosphor/recipes-core/systemd/systemd_%.bbappend b/meta-phosphor/recipes-core/systemd/systemd_%.bbappend
index f9d8301..0e76c2e 100644
--- a/meta-phosphor/recipes-core/systemd/systemd_%.bbappend
+++ b/meta-phosphor/recipes-core/systemd/systemd_%.bbappend
@@ -2,7 +2,7 @@
             "${exec_prefix}/lib/systemd/catalog/*.*.catalog"
 PACKAGES =+ "${PN}-catalog-extralocales"
 PACKAGECONFIG = "pam hostnamed networkd randomseed resolved sysusers timedated \
-                 timesyncd xz"
+                 timesyncd xz kmod"
 
 FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
 SRC_URI += "file://default.network"